Number of collisions and number of fatalities will not necessarily have the same proportions as for humans. You could have a car that never gets into little co

Number of collisions and number of fatalities will not necessarily have the same proportions as for humans. You could have a car that never gets into little collisions that often happen to human drivers because of carelessness, but are rarely deadly, but the same AI might have a faulty reasoning every once in a while leading it to accelerate to 200kph before running straight into a wall. This hypothetical AI would have very few collisions, but maybe still be much more deadly than a human. Humans are the only data we currently have significant numbers of miles logged for. Any extrapolation to AI is meaningless.